JP2006300294A - Cage for rolling bearing - Google Patents

Cage for rolling bearing Download PDF

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JP2006300294A
JP2006300294A JP2005126968A JP2005126968A JP2006300294A JP 2006300294 A JP2006300294 A JP 2006300294A JP 2005126968 A JP2005126968 A JP 2005126968A JP 2005126968 A JP2005126968 A JP 2005126968A JP 2006300294 A JP2006300294 A JP 2006300294A
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cage
film
coating
alloy
rolling bearing
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Shinichi Kawada
真一 河田
Hisashi Kawamura
久 河村
Masaru Konno
大 金野
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/56—Selection of substances
    • F16C33/565—Coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/26—Alloys based on magnesium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
    • F16C2206/02—Carbon based material
    • F16C2206/04—Diamond like carbon [DLC]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cage for a rolling bearing capable of exhibiting excellent lubricity, wear resistance and corrosion resistance (corrosion preventive properties) even when the anti-friction bearing is rotating at a high speed. <P>SOLUTION: In the cage 2 for the anti-friction bearing, a plurality of layers of films 4, 6 are formed by a surface treatment on at least a slide-contact surface to a raceway ring and a slide-contact surface to a rolling body of surfaces of the cage and the film 6 of a middle layer intervened between the film 4 of an outermost surface layer and the cage is set to have stiffness at least higher than that of the cage. In this case, a magnesium alloy is used as a material of the cage. A DLC film is formed on the outermost surface layer. An anodic oxide film or an alumina (Al<SB>2</SB>O<SB>3</SB>) film is formed on the middle layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、転がり軸受用保持器に関するものであり、特に、ジェットエンジンやガスタービンエンジンのギアボックス用の軸受、減速機用の高速ピニオン軸受などのように高速で使用される転がり軸受に好適な保持器に関する。   The present invention relates to a cage for a rolling bearing, and is particularly suitable for a rolling bearing used at a high speed such as a gear box bearing for a jet engine or a gas turbine engine, a high-speed pinion bearing for a reduction gear, or the like. Related to cage.

従来から、高速回転して使用される転がり軸受の保持器には、その材料として図５の保持器材料の物性値表に示すような各種の素材が用いられてきた。例えば、保持器の材料として、Ｖ・４３４０Ｈ(Ｎｉ−Ｃｒ−Ｍｏ鋼)やＨＢＳＣ１(高力黄銅)などの比重の大きな素材が用いられる場合がある(特許文献１参照)。この場合、転がり軸受の回転に伴い当該保持器も回転し、その遠心力によって当該保持器の内部に内部応力(フープ応力)が発生する。上記のような比重の大きな素材からなる保持器の場合、回転による遠心力が大きく作用するため、フープ応力もそれに伴って大きくなる。また、例えばジェットエンジンやガスタービンエンジンなどの転がり軸受に前記保持器が用いられる場合、当該転がり軸受とともに当該保持器も高速回転し、遠心力が大きく作用するため、フープ応力は大きくなる。そして、転がり軸受がさらに高速回転を続け、保持器が遠心力の影響を受け続けると、保持器は内部に発生するフープ応力に耐えられなくなり、回転中に破損してしまう場合がある。 Conventionally, various materials as shown in the physical property value table of the cage material in FIG. 5 have been used for the cage of the rolling bearing used at high speed. For example, a material having a large specific gravity such as V · 4340H (Ni—Cr—Mo steel) or HB S C1 (high strength brass) may be used as the material of the cage (see Patent Document 1). In this case, the retainer also rotates with the rotation of the rolling bearing, and an internal stress (hoop stress) is generated inside the retainer due to the centrifugal force. In the case of a cage made of a material having a large specific gravity as described above, since centrifugal force due to rotation acts greatly, the hoop stress also increases accordingly. In addition, when the cage is used in a rolling bearing such as a jet engine or a gas turbine engine, the cage also rotates at a high speed together with the rolling bearing, and the centrifugal force acts greatly, so that the hoop stress increases. If the rolling bearing continues to rotate at a higher speed and the cage continues to be affected by centrifugal force, the cage may not be able to withstand the hoop stress generated inside and may be damaged during rotation.

そこで、例えば、保持器の材料としてＡｌ合金(Ａ６０６１)、エンジニアリングプラスチック(ＰＥＥＫ)などの比重の小さな素材を用いることも考えられる(特許文献２参照)。この場合、当該保持器は回転する際の遠心力が小さくなるため、当該保持器の内部に発生するフープ応力も小さくなる。しかしながら、当該保持器では、高速回転に耐え得る高温強度特性や潤滑特性、摩耗特性を十分得ることはできない。 Therefore, for example, a material having a small specific gravity such as an Al alloy (A6061) or engineering plastic (PEEK) may be used as the material of the cage (see Patent Document 2). In this case, since the centrifugal force when the cage rotates is small, the hoop stress generated inside the cage is also small. However, the cage cannot sufficiently obtain high-temperature strength characteristics, lubrication characteristics, and wear characteristics that can withstand high-speed rotation.

このような不都合を解消するための方策として、例えば図４に示すように、軽金属の中でも、比重が小さく、比強度に優れたＭｇ合金(ＡＺ３１Ａ)を保持器２の材料として用いた上で、当該保持器２に表面処理を施し、潤滑特性や摩耗特性を向上させることが考えられる。この場合、保持器２の表面処理により、例えば、トライボロジ特性(摩耗特性・摩擦特性・潤滑特性)の優れたＤＩＡＭＯＮＤ ＬＩＫＥ ＣＡＲＢＯＮ被膜(以下、ＤＬＣ被膜４という)を形成することによって、保持器２の潤滑特性や摩耗特性を向上させることができる。 As a measure for eliminating such inconvenience, for example, as shown in FIG. 4, among light metals, Mg alloy (AZ31A) having a small specific gravity and excellent specific strength is used as a material for the cage 2. It is conceivable that the cage 2 is subjected to a surface treatment to improve lubrication characteristics and wear characteristics. In this case, by forming a DIAMOND LIKE CARBON film (hereinafter referred to as DLC film 4) having excellent tribological characteristics (wear characteristics, friction characteristics, and lubrication characteristics) by surface treatment of the cage 2, Lubrication characteristics and wear characteristics can be improved.

しかし、保持器２(Ｍｇ合金(ＡＺ３１Ａ))は、その表面の硬さがＤＬＣ被膜４を形成する上で不十分なため、ＤＬＣ被膜４と保持器２との間の密着性が弱くなってしまう。このため、保持器２の表面にＤＬＣ被膜４を形成したとしても、ＤＬＣ被膜４のトライボロジ特性を十分発揮させることができない虞がある。
また、保持器２(Ｍｇ合金(ＡＺ３１Ａ))には、その電極電位が卑である金属(マグネシウム)が含まれているため、耐食性(防食性)が弱く、その表面にＤＬＣ被膜４を施したとしても、保持器２の耐食性(防食性)を十分に確保することができない虞もある。
特開２００３−３４３５６６号公報 特開２００５−４８７９９号公報 However, since the cage 2 (Mg alloy (AZ31A)) has insufficient surface hardness to form the DLC coating 4, the adhesion between the DLC coating 4 and the cage 2 is weakened. End up. For this reason, even if the DLC film 4 is formed on the surface of the cage 2, the tribological characteristics of the DLC film 4 may not be exhibited sufficiently.
Further, since the cage 2 (Mg alloy (AZ31A)) contains a metal (magnesium) whose electrode potential is base, the corrosion resistance (corrosion resistance) is weak, and the DLC coating 4 is applied to the surface thereof. However, there is a possibility that the corrosion resistance (anticorrosion) of the cage 2 cannot be sufficiently ensured.
JP 2003-343666 A JP 2005-48799 A

本発明は、このような課題を解決するためになされており、その目的は、転がり軸受の高速回転時においても優れた潤滑性、耐摩耗性、耐食性(防食性)を発揮することが可能な転がり軸受用保持器を提供することにある。 The present invention has been made in order to solve such problems, and the purpose thereof is to exhibit excellent lubricity, wear resistance, and corrosion resistance (corrosion resistance) even when the rolling bearing rotates at high speed. An object of the present invention is to provide a cage for a rolling bearing.

このような目的を達成するために、本発明の転がり軸受用保持器は、当該保持器の表面のうち少なくとも軌道輪に対する摺接面及び転動体に対する摺接面に、表面処理によって複数層の被膜が形成されており、最表面層の被膜と保持器との間に介在された中間層の被膜は、少なくともその硬度が保持器の硬度よりも高く設定されている。
この場合、保持器の材料には、マグネシウム合金が用いられている。また、最表面層には、ＤＬＣ被膜が形成されている。
なお、中間層には、陽極酸化被膜若しくはアルミナ(Ａｌ２Ｏ３)被膜が形成されている。 In order to achieve such an object, the rolling bearing retainer of the present invention comprises a plurality of layers of coatings by surface treatment on at least the sliding contact surface with respect to the bearing ring and the sliding contact surface with respect to the rolling element, of the surface of the cage. The intermediate layer film interposed between the outermost surface layer film and the cage is set to have a hardness at least higher than the hardness of the cage.
In this case, a magnesium alloy is used as the material of the cage. A DLC film is formed on the outermost surface layer.
Note that an anodic oxide coating or an alumina (Al 2 O 3 ) coating is formed on the intermediate layer.

本発明によれば、転がり軸受用の保持器に表面処理を施し、複数層の被膜を形成することで、転がり軸受の高速回転時においても、保持器は、優れた潤滑性、耐摩耗性、耐食性(防食性)を発揮することができる。 According to the present invention, the cage is provided with excellent lubricity, wear resistance, even during high-speed rotation of the rolling bearing by applying a surface treatment to the rolling bearing cage and forming a multilayer coating. Corrosion resistance (corrosion resistance) can be exhibited.

以下、本発明の一実施形態に係る転がり軸受用保持器について、添付図面を参照して説明する。
図１に示すように、本実施形態の転がり軸受用保持器２には、その表面全体に表面処理が施されており、例えば２層の被膜4,6が形成されている。なお、以下の説明において、被膜６を中間層、被膜４を最表面層という。 Hereinafter, a rolling bearing retainer according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the rolling bearing retainer 2 of the present embodiment is subjected to a surface treatment on the entire surface, for example, two layers of coatings 4 and 6 are formed. In the following description, the coating 6 is referred to as an intermediate layer, and the coating 4 is referred to as an outermost layer.

保持器２の材料としては、例えば、軽金属の中でも比重が小さく、比強度に優れたマグネシウム合金(Ｍｇ合金)を用いることができるが、本実施形態では一例として、ＡＳＴＭ(Ａｍｅｒｉｃａｎ Ｓｏｃｉｅｔｙ ｆｏｒ Ｔｅｓｔｉｎｇ ａｎｄ Ｍａｔｅｒｉａｌ：アメリカ材料試験協会)規格のＭｇ合金(ＡＺ３１Ａ)を用いている。図５の保持器材料の物性値表に示すように、Ｍｇ合金(ＡＺ３１Ａ)は、比重がＡｌ合金の約２／３、高力黄銅の約１／５にすぎない。このため、Ｍｇ合金(ＡＺ３１Ａ)を保持器２の材料として用いると、保持器２が高速回転時に受ける遠心力を小さくすることができ、保持器２の内部に発生する内部応力(フープ応力)も小さくすることができる。また、Ｍｇ合金(ＡＺ３１Ａ)は、比強度がＡｌ合金の約１．５倍、高力黄銅の約３倍であるため、高速回転時における保持器２の強度を確保する材料として好適な素材である。さらに、Ｍｇ合金(ＡＺ３１Ａ)は、他の金属素材と比較して減衰係数が大きいため、振動吸収性にも優れている。 As a material of the cage 2, for example, a magnesium alloy (Mg alloy) having a small specific gravity and excellent in specific strength among light metals can be used. In this embodiment, as an example, ASTM (American Society for Testing and Material) : American Society for Testing Materials) standard Mg alloy (AZ31A) is used. As shown in the table of physical properties of the cage material in FIG. 5, the Mg alloy (AZ31A) has a specific gravity of only about 2/3 of the Al alloy and about 1/5 of the high-strength brass. For this reason, when Mg alloy (AZ31A) is used as the material of the cage 2, the centrifugal force that the cage 2 receives during high-speed rotation can be reduced, and the internal stress (hoop stress) generated inside the cage 2 is also reduced. Can be small. In addition, Mg alloy (AZ31A) has a specific strength of about 1.5 times that of Al alloy and about 3 times that of high-strength brass. Therefore, Mg alloy (AZ31A) is a material suitable for securing the strength of cage 2 at high speed rotation. is there. Furthermore, since the Mg alloy (AZ31A) has a large damping coefficient compared to other metal materials, it is excellent in vibration absorption.

中間層となる被膜６は、保持器２の表面を陽極酸化処理することにより、保持器２の表面に陽極酸化被膜６として形成されている。これにより、保持器２(Ｍｇ合金(ＡＺ３１Ａ))が軸受鋼(例えば、高炭素クロム軸受鋼)と直に接触しなくなるため、電極電位が卑であるＭｇ合金(ＡＺ３１Ａ)の耐食性(防食性)の弱さを解消させることができる。なお、陽極酸化被膜６自体にも耐食性(防食性)があるため、保持器２の耐食性(防食性)を向上させることができる。 The film 6 serving as an intermediate layer is formed as an anodized film 6 on the surface of the cage 2 by anodizing the surface of the cage 2. As a result, the cage 2 (Mg alloy (AZ31A)) does not come into direct contact with the bearing steel (for example, high carbon chrome bearing steel), so the corrosion resistance (anticorrosion) of the Mg alloy (AZ31A) whose electrode potential is base. Can be resolved. Since the anodic oxide coating 6 itself has corrosion resistance (corrosion resistance), the corrosion resistance (corrosion resistance) of the cage 2 can be improved.

また、当該陽極酸化被膜６は、保持器２(Ｍｇ合金(ＡＺ３１Ａ))の表面硬度を高めるため(当該陽極酸化被膜６の硬度が、保持器２(Ｍｇ合金(ＡＺ３１Ａ))の硬度よりも高いため)、後述する表面処理によってＤＬＣ被膜４が形成される際に、当該陽極酸化被膜６を介してＤＬＣ被膜４と保持器２との間の密着性を高めることができる。
なお、ここでは特に陽極酸化処理の方法については限定しないが、陽極酸化工程と封孔工程があることが好ましい。また、陽極酸化被膜６の膜厚は、１０〜１５μｍであることが好ましい。 Further, the anodic oxide coating 6 increases the surface hardness of the cage 2 (Mg alloy (AZ31A)) (the hardness of the anodic oxide coating 6 is higher than the hardness of the cage 2 (Mg alloy (AZ31A)). Therefore, when the DLC film 4 is formed by the surface treatment described later, the adhesion between the DLC film 4 and the cage 2 can be enhanced via the anodic oxide film 6.
In addition, although it does not specifically limit about the method of an anodizing process here, it is preferable that there exist an anodizing process and a sealing process. Moreover, it is preferable that the film thickness of the anodized film 6 is 10-15 micrometers.

陽極酸化被膜６の表面には、最表面層を構成するＤＬＣ被膜４が形成されている。ＤＬＣ被膜４は、トライボロジ特性(摩耗特性・摩擦特性・潤滑特性)に優れているため、保持器２の最表面層(本実施例では、陽極酸化被膜６の表面)にＤＬＣ被膜４を形成することで、保持器２の潤滑特性や摩耗特性を向上させることができる。なお、当該ＤＬＣ被膜４には、クロム(Ｃｒ)とタングステン(Ｗ)が含有されている。 On the surface of the anodic oxide coating 6, a DLC coating 4 constituting the outermost surface layer is formed. Since the DLC film 4 is excellent in tribological characteristics (wear characteristics, friction characteristics, and lubrication characteristics), the DLC film 4 is formed on the outermost surface layer of the cage 2 (the surface of the anodized film 6 in this embodiment). Thus, the lubrication characteristics and wear characteristics of the cage 2 can be improved. The DLC film 4 contains chromium (Cr) and tungsten (W).

ここで、保持器２(Ｍｇ合金(ＡＺ３１Ａ))の摩擦特性について、一例として、Ｍｇ合金(ＡＺ３１Ａ)ディスク１２を用いてピンオンディスク試験装置により測定した(図３(ａ)に示す試験装置参照)。この場合、Ｍｇ合金(ＡＺ３１Ａ)ディスク１２として、中間層被膜(陽極酸化被膜６)の表面に最表面層被膜(ＤＬＣ被膜４)が形成されたＭｇ合金(ＡＺ３１Ａ)ディスク(以下、実施形態例１のディスクという)と、表面に何ら被膜処理を施していないＭｇ合金(ＡＺ３１Ａ)ディスク(以下、比較例のディスクという)とを用いた。当該試験では、ピン１０の種類として表面に被膜処理を施していないＡＩＳＩ(Ａｍｅｒｉｃａｎ Ｉｒｏｎ ａｎｄ Ｓｔｅｅｌ Ｉｎｓｔｉｔｕｔｅ：アメリカ鉄鋼協会)規格の耐熱高速度鋼材(Ｍ５０材)を使用し、実施形態例１及び比較例のディスクを速度１０００ｒｐｍで回転させ、当該ディスク表面にピン１０から３９．２ｋｇｆの荷重を加えた(図３(ｂ)に示す測定条件参照)。なお、この場合、Ｍｇ合金(ＡＺ３１Ａ)ディスク１２の直径φを５５ｍｍ、ピン１０の先端を曲率半径Ｒ＝４ｍｍの曲面として、ディスク１２の中心からの距離Ｌ＝１５ｍｍの位置でピン１０の先端をディスク表面に当接させている(図３(ａ)参照)。 Here, as an example, the friction characteristics of the cage 2 (Mg alloy (AZ31A)) were measured by a pin-on-disk test apparatus using an Mg alloy (AZ31A) disk 12 (see the test apparatus shown in FIG. 3A). ). In this case, as the Mg alloy (AZ31A) disk 12, an Mg alloy (AZ31A) disk (hereinafter referred to as Embodiment 1) in which the outermost layer film (DLC film 4) is formed on the surface of the intermediate layer film (anodized film 6). And an Mg alloy (AZ31A) disk (hereinafter referred to as a disk of a comparative example) whose surface was not coated at all. In this test, a heat resistant high speed steel material (M50 material) of AISI (American Iron and Steel Institute) standard whose surface is not coated is used as the type of pin 10, and Example 1 and Comparative Example The disc was rotated at a speed of 1000 rpm, and a load of 39.2 kgf was applied from the pin 10 to the surface of the disc (see the measurement conditions shown in FIG. 3B). In this case, the diameter φ of the Mg alloy (AZ31A) disk 12 is 55 mm, the tip of the pin 10 is a curved surface with a radius of curvature R = 4 mm, and the tip of the pin 10 is positioned at a distance L = 15 mm from the center of the disk 12. It is made to contact | abut on the disk surface (refer Fig.3 (a)).

測定の結果、実施形態例１のディスク表面の摩擦係数は０．２〜０．３で、比較例のディスク表面の摩擦係数０．８〜１．０の約１／５〜１／３となった(図３(ｃ)に示す測定結果参照)。また、試験後の実施形態例１のディスク表面には損傷は見られず、凝着(損傷)が観察された比較例のディスク表面とは、顕著な相違があった(同測定結果参照)。
したがって、保持器２の表面(Ｍｇ合金(ＡＺ３１Ａ)の表面)に中間層となる陽極酸化被膜６を形成し、さらに当該陽極酸化被膜６の表面に最表面層となるＤＬＣ被膜４を形成することで、保持器２の耐摩擦性を向上させることができる。 As a result of the measurement, the friction coefficient of the disk surface of Example 1 is 0.2 to 0.3, which is about 1/5 to 1/3 of the friction coefficient 0.8 to 1.0 of the disk surface of the comparative example. (See the measurement results shown in FIG. 3 (c)). Further, no damage was observed on the disk surface of Example 1 after the test, and there was a significant difference from the disk surface of the comparative example in which adhesion (damage) was observed (see the same measurement result).
Therefore, the anodic oxide coating 6 serving as an intermediate layer is formed on the surface of the cage 2 (the surface of the Mg alloy (AZ31A)), and further the DLC coating 4 serving as the outermost layer is formed on the surface of the anodic oxide coating 6. Thus, the friction resistance of the cage 2 can be improved.

また、本発明は、上述の実施形態に限定されず、以下のように変更することができる。上述の実施形態例では、中間層として陽極酸化被膜６を形成したが、これに代えて、例えば図２に示すように、中間層としてアルミナ(Ａｌ２Ｏ３)被膜８を形成してもよい。この場合、アルミナ(Ａｌ２Ｏ３)被膜８の形成方法としては、例えば、カロライジング処理を適用することができる。なお、カロライジング処理とは、材料の表面にＡｌ素材を拡散浸透させる処理であり、これを保持器２の表面(Ｍｇ合金(ＡＺ３１Ａ)の表面)に対して施すことで、保持器２の表面にアルミナ(Ａｌ２Ｏ３)被膜８を形成することができる。 Moreover, this invention is not limited to the above-mentioned embodiment, It can change as follows. In the above-described embodiment, the anodic oxide coating 6 is formed as the intermediate layer. Instead, for example, as shown in FIG. 2, an alumina (Al 2 O 3 ) coating 8 may be formed as the intermediate layer. . In this case, as a method for forming the alumina (Al 2 O 3 ) coating 8, for example, calorizing treatment can be applied. The calorizing treatment is a treatment for diffusing and infiltrating the Al material into the surface of the material. By applying this to the surface of the cage 2 (the surface of the Mg alloy (AZ31A)), the surface of the cage 2 Then, an alumina (Al 2 O 3 ) coating 8 can be formed.

これにより、保持器２(Ｍｇ合金(ＡＺ３１Ａ))が軸受鋼(例えば、高炭素クロム軸受鋼)と直に接触しなくなるため、電極電位が卑であるＭｇ合金(ＡＺ３１Ａ)の耐食性(防食性)の弱さを解消させることができる。なお、アルミナ(Ａｌ２Ｏ３)被膜８自体にも耐食性(防食性)があるため、保持器２の耐食性(防食性)を向上させることができる。
また、当該アルミナ(Ａｌ２Ｏ３)被膜８は、保持器２(Ｍｇ合金(ＡＺ３１Ａ))の表面硬度を高めるため(当該アルミナ(Ａｌ２Ｏ３)被膜８の硬度が、保持器２(Ｍｇ合金(ＡＺ３１Ａ))の硬度よりも高いため)、表面処理としてＤＬＣ被膜４が形成される際に、当該アルミナ(Ａｌ２Ｏ３)被膜８を介してＤＬＣ被膜４と保持器２との間の密着性を高めることができる。 As a result, the cage 2 (Mg alloy (AZ31A)) does not come into direct contact with the bearing steel (for example, high carbon chrome bearing steel), so the corrosion resistance (anticorrosion) of the Mg alloy (AZ31A) whose electrode potential is base. Can be resolved. Since the alumina (Al 2 O 3 ) coating 8 itself has corrosion resistance (corrosion resistance), the corrosion resistance (corrosion resistance) of the cage 2 can be improved.
Further, the alumina (Al 2 O 3 ) coating 8 increases the surface hardness of the cage 2 (Mg alloy (AZ31A)) (the hardness of the alumina (Al 2 O 3 ) coating 8 is the cage 2 (Mg (Because it is higher than the hardness of the alloy (AZ31A)), when the DLC coating 4 is formed as a surface treatment, the DLC coating 4 and the cage 2 are interposed via the alumina (Al 2 O 3 ) coating 8. Adhesion can be increased.

このように、中間層被膜としてアルミナ(Ａｌ２Ｏ３)被膜８が形成されている場合にも、当該アルミナ(Ａｌ２Ｏ３)被膜８の表面に、最表面層としてＤＬＣ被膜４を形成することで、中間層被膜として陽極酸化被膜６を形成した場合と同様に、保持器２の潤滑特性や摩耗特性を向上させることができる。なお、この場合も、当該ＤＬＣ被膜４には、クロム(Ｃｒ)とタングステン(Ｗ)をそれぞれ含有させている。 Thus, even when the alumina (Al 2 O 3 ) coating 8 is formed as the intermediate layer coating, the DLC coating 4 is formed as the outermost surface layer on the surface of the alumina (Al 2 O 3 ) coating 8. Thus, as in the case where the anodic oxide film 6 is formed as the intermediate film, the lubrication characteristics and wear characteristics of the cage 2 can be improved. Also in this case, the DLC film 4 contains chromium (Cr) and tungsten (W).

また、上記保持器２(Ｍｇ合金(ＡＺ３１Ａ))の摩擦特性についても、図３(ａ)に示すようなピンオンディスク試験装置により測定した。この場合、Ｍｇ合金(ＡＺ３１Ａ)ディスク１２として、中間層被膜(アルミナ(Ａｌ２Ｏ３)被膜８)の表面に最表面層被膜(ＤＬＣ被膜４)が形成されたＭｇ合金(ＡＺ３１Ａ)ディスク(以下、実施形態例２のディスクという)を用いた。 Further, the friction characteristics of the cage 2 (Mg alloy (AZ31A)) were also measured by a pin-on-disk test apparatus as shown in FIG. In this case, as the Mg alloy (AZ31A) disk 12, an Mg alloy (AZ31A) disk (hereinafter referred to as the outermost layer film (DLC film 4) formed on the surface of the intermediate layer film (alumina (Al 2 O 3 ) film 8)). The disk of Embodiment 2 was used.

実施形態例１のディスクの場合と同様の測定条件(図３(ｂ)に示す測定条件参照)で測定した結果、実施形態例２のディスク表面の摩擦係数は０．２〜０．３であり、試験後の実施形態例２のディスク表面にも損傷は見られないという実施形態例１のディスクと同様の結果が得られた(図３(ｃ)に示す測定結果参照)。
したがって、保持器２の表面(Ｍｇ合金(ＡＺ３１Ａ)の表面)に中間層被膜としてアルミナ(Ａｌ２Ｏ３)被膜８を形成し、さらに当該アルミナ(Ａｌ２Ｏ３)被膜８の表面に最表面層としてＤＬＣ被膜４を形成することで、保持器２の耐摩擦性を向上させることができる。 As a result of measurement under the same measurement conditions as in the case of the disk of Embodiment 1 (see the measurement conditions shown in FIG. 3B), the friction coefficient of the disk surface of Embodiment 2 is 0.2 to 0.3. The same result as that of the disk of Example 1 that no damage was observed on the disk surface of Example 2 after the test was obtained (see the measurement result shown in FIG. 3C).
Therefore, an alumina (Al 2 O 3 ) film 8 is formed as an intermediate film on the surface of the cage 2 (the surface of the Mg alloy (AZ31A)), and the outermost surface is formed on the surface of the alumina (Al 2 O 3 ) film 8. By forming the DLC film 4 as a layer, the friction resistance of the cage 2 can be improved.

なお、上述した実施形態例及び変形例においては、保持器２の表面全体に表面処理を施しているが、当該保持器２の表面のうち、軌道輪に対する摺接面及び転動体に対する摺接面にのみ表面処理を施してもよい。また、中間層被膜として、陽極酸化被膜６若しくはアルミナ(Ａｌ２Ｏ３)被膜８をそれぞれ１層のみ形成したが、複数層で中間層被膜を構成してもよい。例えば、複数の陽極酸化被膜６で中間層を構成してもよく、陽極酸化被膜６とアルミナ(Ａｌ２Ｏ３)被膜８とを組み合わせて中間層を構成してもよい。
また、上述した実施形態例及び変形例においては、保持器２の種類について特に限定しなかったが、例えば、冠型保持器、波型保持器、もみ抜き保持器、打ち抜き保持器など各種の保持器２を適用することができる。なお、転がり軸受としては、例えば、ラジアル軸受やスラスト軸受を適用することができる。さらに、転がり軸受に組み込む転動体としては、例えば、玉やころを適用することができる。 In the embodiment and the modification described above, the entire surface of the cage 2 is subjected to a surface treatment. Among the surfaces of the cage 2, the sliding surface for the raceway and the sliding surface for the rolling element are used. Surface treatment may be performed only on the surface. Further, only one anodic oxide coating 6 or alumina (Al 2 O 3 ) coating 8 is formed as the intermediate coating, but the intermediate coating may be composed of a plurality of layers. For example, the intermediate layer may be constituted by a plurality of anodic oxide coatings 6, or the intermediate layer may be constituted by combining anodic oxide coating 6 and alumina (Al 2 O 3 ) coating 8.
In the embodiment and the modification described above, the type of the retainer 2 is not particularly limited. For example, various retainers such as a crown retainer, a corrugated retainer, a punched retainer, and a punch retainer. A vessel 2 can be applied. As the rolling bearing, for example, a radial bearing or a thrust bearing can be applied. Furthermore, as a rolling element incorporated in a rolling bearing, for example, balls or rollers can be applied.

本発明の一実施形態に係る転がり軸受用保持器に形成された被膜の構成例を示す断面図。Sectional drawing which shows the structural example of the film formed in the cage for rolling bearings concerning one Embodiment of this invention. 本発明の変形例に係る転がり軸受用保持器に形成された被膜の構成例を示す断面図。Sectional drawing which shows the structural example of the film formed in the cage for rolling bearings which concerns on the modification of this invention. 本発明の一実施形態と変形例に係る転がり軸受用保持器の摩擦特性の測定方法を説明するための図であって、(ａ)は、ピンオンディスク試験装置の概要を示す図、(ｂ)は、測定条件を示す図、(ｃ)は、測定結果を示す図。It is a figure for demonstrating the measuring method of the friction characteristic of the cage for rolling bearings which concerns on one Embodiment and modification of this invention, Comprising: (a) is a figure which shows the outline | summary of a pin-on-disk test apparatus, (b) ) Is a diagram showing measurement conditions, and (c) is a diagram showing measurement results. 現状の転がり軸受用保持器に形成された被膜の構成を示す断面図。Sectional drawing which shows the structure of the film formed in the existing roller bearing retainer. 転がり軸受用保持器の材料の特性を示す図。The figure which shows the characteristic of the material of the cage for rolling bearings.

符号の説明Explanation of symbols

２ 転がり軸受用保持器
４ ＤＬＣ被膜(最表面層被膜)
６ 陽極酸化被膜(中間層被膜)
８ アルミナ(Ａｌ２Ｏ３)被膜(中間層被膜)
１０ ピン
１２ Ｍｇ合金(ＡＺ３１Ａ)ディスク
2 Rolling bearing cage 4 DLC coating (outermost layer coating)
6 Anodized film (interlayer film)
8 Alumina (Al 2 O 3 ) coating (interlayer coating)
10 pin 12 Mg alloy (AZ31A) disc

Claims (5)

転がり軸受用の保持器において、
当該保持器の表面のうち少なくとも軌道輪に対する摺接面及び転動体に対する摺接面には、表面処理によって複数層の被膜が形成されており、最表面層の被膜と保持器との間に介在された中間層の被膜は、少なくともその硬度が保持器の硬度よりも高く設定されていることを特徴とする転がり軸受用保持器。 In cages for rolling bearings,
Of the surface of the cage, at least the sliding surface with respect to the race and the sliding surface with respect to the rolling element are formed with a plurality of layers by surface treatment, and are interposed between the coating on the outermost surface layer and the cage. A cage for a rolling bearing, wherein the intermediate layer coating is set to have a hardness at least higher than the hardness of the cage. 保持器の材料は、マグネシウム合金であることを特徴とする請求項１に記載の転がり軸受用保持器。 The rolling bearing cage according to claim 1, wherein a material of the cage is a magnesium alloy. 最表面層には、ＤＬＣ被膜が形成されていることを特徴とする請求項１又は２に記載の転がり軸受用保持器。 The rolling bearing retainer according to claim 1 or 2, wherein a DLC film is formed on the outermost surface layer. 中間層には、陽極酸化被膜が形成されていることを特徴とする請求項１乃至３のいずれかに記載の転がり軸受用保持器。 The rolling bearing retainer according to any one of claims 1 to 3, wherein an anodic oxide coating is formed on the intermediate layer. 中間層には、アルミナ(Ａｌ２Ｏ３)被膜が形成されていることを特徴とする請求項１乃至３のいずれかに記載の転がり軸受用保持器。
The rolling bearing retainer according to any one of claims 1 to 3 , wherein an alumina (Al 2 O 3 ) coating is formed on the intermediate layer.
JP2005126968A 2005-04-25 2005-04-25 Cage for rolling bearing Pending JP2006300294A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2206800A1 (en) 2008-12-26 2010-07-14 Hitachi Ltd. Slide member
WO2011111729A1 (en) * 2010-03-10 2011-09-15 Ntn株式会社 Cage and rolling bearing
WO2011122662A1 (en) 2010-03-30 2011-10-06 Ntn株式会社 Anti-friction bearing
WO2013042765A1 (en) 2011-09-22 2013-03-28 Ntn株式会社 Hard film, hard film formed body, and rolling bearing
CN104235188A (en) * 2014-10-14 2014-12-24 中航工业哈尔滨轴承有限公司 Bonding method for bearing phenolic resin textolite cage and aluminium sheet
EP3002351A1 (en) * 2014-10-01 2016-04-06 Rolls-Royce Corporation Corrosion and abrasion resistant coating

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2206800A1 (en) 2008-12-26 2010-07-14 Hitachi Ltd. Slide member
WO2011111729A1 (en) * 2010-03-10 2011-09-15 Ntn株式会社 Cage and rolling bearing
US9284982B2 (en) 2010-03-10 2016-03-15 Ntn Corporation Cage and rolling bearing
WO2011122662A1 (en) 2010-03-30 2011-10-06 Ntn株式会社 Anti-friction bearing
US9051653B2 (en) 2010-03-30 2015-06-09 Ntn Corporation Rolling bearing
WO2013042765A1 (en) 2011-09-22 2013-03-28 Ntn株式会社 Hard film, hard film formed body, and rolling bearing
US9347491B2 (en) 2011-09-22 2016-05-24 Ntn Corporation Hard film, hard film formed body, and rolling bearing
EP3002351A1 (en) * 2014-10-01 2016-04-06 Rolls-Royce Corporation Corrosion and abrasion resistant coating
US10077717B2 (en) 2014-10-01 2018-09-18 Rolls-Royce Corporation Corrosion and abrasion resistant coating
CN104235188A (en) * 2014-10-14 2014-12-24 中航工业哈尔滨轴承有限公司 Bonding method for bearing phenolic resin textolite cage and aluminium sheet

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